﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Diagnostics;

namespace Xceed.Silverlight.Data
{
  [DebuggerStepThrough]
  internal abstract class ContextualGroupParentDataHelper : ContextualParentDataHelper, IContextualGroupDataHelper
  {
    #region Constructor

    protected ContextualGroupParentDataHelper( IContextualGroupDataHelper childDataHelper )
      : base( childDataHelper )
    {
      if( childDataHelper == null )
        throw new ArgumentNullException( "childDataHelper" );

      m_childDataHelper = childDataHelper;
    }

    #endregion

    #region ChildDataHelper Propected Property

    protected new IContextualGroupDataHelper ChildDataHelper
    {
      get
      {
        return m_childDataHelper;
      }
    }

    private readonly IContextualGroupDataHelper m_childDataHelper;

    #endregion

    public override DataPath Convert( DataSourceContext context, DataPath value )
    {
      return value;
    }

    public override DataPath ConvertBack( DataSourceContext context, DataPath value )
    {
      return value;
    }

    #region IContextualGroupHelper Member

    public virtual bool IsGroupPath( DataSourceContext context, DataPath item )
    {
      DataPath childItem = this.ConvertBack( context, item );

      return m_childDataHelper.IsGroupPath( context, childItem );
    }

    public virtual DataPath GetGroupPath( DataSourceContext context, DataPath item )
    {
      DataPath childItem = this.ConvertBack( context, item );

      return m_childDataHelper.GetGroupPath( context, childItem );
    }

    public virtual SortPosition CreateSortPosition( DataSourceContext context, DataPath item, StartPosition startPosition )
    {
      DataPath childItem = this.ConvertBack( context, item );

      return m_childDataHelper.CreateSortPosition( context, childItem, startPosition );
    }

    #endregion
  }
}
